Materials Transactions Online

Materials Transactions, Vol.59 No.06 (2018) pp.1009-1012
© 2018 The Japan Institute of Metals and Materials

Combination of High-Pressure Torsion with Incremental Feeding for Upsizing Sample

Etsuko Shigeno1, Takuya Komatsu1, Kosei Sumikawa1, Takahiro Masuda1, 2, Yoichi Takizawa3, Manabu Yumoto3, Yoshiharu Otagiri3 and Zenji Horita1, 2

1Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
2WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan
3Technology Department, Nagano Forging Co., Ltd, Nagano 380-0003, Japan

This study introduces an advanced process solving the limitation involved in the process of high-pressure torsion (HPT). The HPT process is now well recognized as an effective process for significant grain refinement through severe plastic deformation (SPD) in many metallic materials including hard-to-deform materials. However, the applicability of the HPT process is limited to rather small diameters of disks or rings. The new proposed process, which we call incremental feeding HPT (IF-HPT), incorporates consecutive incremental feeding in the conventional HPT process to increase the SPD-processed area. The IF-HPT process is developed based on the principle of our recent SPD process called the incremental feeding high-pressure sliding (IF-HPS). The IF-HPT is applied to a Ni-based superalloy, Inconel 718, and it is demonstrated that the high-strain rate superplasticity is achieved with elongation well more than 400% at 1073 K and an initial strain rate of 2 × 10−2 s−1. It is also proposed that the IF-HPT process can be used to increase the SPD-processed area by lateral feeding of the sheet sample as the IF-HPS developed earlier.

[doi:10.2320/matertrans.M2018039]

(Received 2018/02/01; Accepted 2018/03/27; Published 2018/05/25)

Keywords: high-pressure torsion, severe plastic deformation, superplasticity, superalloy

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